scholarly journals Interfacial Charge Transfer in MoS2/TiO2 Heterostructured Photocatalysts: The Impact of Crystal Facets and Defects

Molecules ◽  
2019 ◽  
Vol 24 (9) ◽  
pp. 1769 ◽  
Author(s):  
Tingcha Wei ◽  
Woon Ming Lau ◽  
Xiaoqiang An ◽  
Xuelian Yu
Keyword(s):  
Charge Transfer ◽  
Hydrogen Evolution ◽  
High Performance ◽  
Synergetic Effect ◽  
Defect Engineering ◽  
Tio2 Photocatalysts ◽  
Fundamental Understanding ◽  
Order Of Magnitude ◽  
The Impact ◽  
Interfacial Charge

One of the most challenging issues in photocatalytic hydrogen evolution is to efficiently separate photocharge carriers. Although MoS2 loading could effectively improve the photoactivity of TiO2, a fundamental understanding of the charge transfer process between TiO2 and MoS2 is still lacking. Herein, TiO2 photocatalysts with different exposed facets were used to construct MoS2/TiO2 heterostructures. XPS, ESR, together with PL measurements evidenced the Type II electron transfer from MoS2 to {001}-TiO2. Differently, electron-rich characteristic of {101}-faceted TiO2 were beneficial for the direct Z-scheme recombination of electrons in TiO2 with holes in MoS2. This synergetic effect between facet engineering and oxygen vacancies resulted in more than one order of magnitude enhanced hydrogen evolution rate. This finding revealed the elevating mechanism of constructing high-performance MoS2/TiO2 heterojunction based on facet and defect engineering.

scholarly journals Ice Coverage Induced by Depositing a Water Drop onto the Supercooled Substrate at Extreme Low Vapor Pressure

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 691
Author(s):  
Yugang Zhao ◽  
Zichao Zuo ◽  
Haibo Tang ◽  
Xin Zhang
Keyword(s):  
Vapor Pressure ◽  
Substrate Temperature ◽  
Water Drop ◽  
Industrial Processes ◽  
Aircraft Icing ◽  
Ice Coverage ◽  
Fundamental Understanding ◽  
Order Of Magnitude ◽  
The Impact ◽  
Kinetics Of

Icing/snowing/frosting is ubiquitous in nature and industrial processes, and the accretion of ice mostly leads to catastrophic consequences. The existing understanding of icing is still limited, particularly for aircraft icing, where direct observation of the freezing dynamics is inaccessible. In this work, we investigate experimentally the impact and freezing of a water drop onto the supercooled substrate at extremely low vapor pressure, to mimic an aircraft passing through clouds at a relatively high altitude, engendering icing upon collisions with pendant drops. Special attention is focused on the ice coverage induced by an impinging drop, from the perimeter pointing outward along the radial direction. We observed two freezing regimes: (I) spread-recoil-freeze at the substrate temperature of Ts = −15.4 ± 0.2 °C and (II) spread (incomplete)-freeze at the substrate temperature of Ts = −22.1 ± 0.2 °C. The ice coverage is approximately one order of magnitude larger than the frozen drop itself, and counterintuitively, larger supercooling yields smaller ice coverage in the range of interest. We attribute the variation of ice coverage to the kinetics of vapor diffusion in the two regimes. This fundamental understanding benefits the design of new anti-icing technologies for aircraft.

THE ELECTRONIC STRUCTURE AT ORGANIC–2D MATERIAL HETEROINTERFACES

2021 ◽  
pp. 2140003
Author(s):  
YU LI HUANG ◽  
ANDREW THYE SHEN WEE
Keyword(s):  
Charge Transfer ◽  
Electronic Structures ◽  
Transition Metal Dichalcogenides ◽  
2D Material ◽  
Physical Mechanisms ◽  
Wide Range ◽  
Fundamental Understanding ◽  
Potential Applications ◽  
Metal Dichalcogenides ◽  
Interfacial Charge

Organic–2D material heterostructures have attracted intensive research interest due to their intriguing properties, with a wide range of potential applications in multifunctional flexible electronic and optoelectronic devices. Central to the realization of such devices is a fundamental understanding of the electronic structures at organic–2D material heterointerfaces. The energy level alignment (ELA) at the interface is of paramount importance because it determines the charge transfer barriers between the two materials in contact. In this paper, we discuss the physical mechanisms determining the ELAs, with special attention on interfacial charge transfer at the heterostructures. We review the current understanding of electronic properties at the heterointerfaces formed by the integration of organics with graphene and 2D transition metal dichalcogenides (TMDs), and conclude with a perspective on the future development of organic–2D material heterostructure.

Boosting interfacial charge transfer for alkaline hydrogen evolution via rational interior Se modification

Nano Energy ◽  
2021 ◽  
Vol 81 ◽  
pp. 105641
Author(s):  
Yi Liu ◽  
Qingguo Feng ◽  
Wei Liu ◽  
Qian Li ◽  
Yuchao Wang ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Hydrogen Evolution ◽  
Interfacial Charge Transfer ◽  
Interfacial Charge

A hybrid of CdS/HCa2Nb3O10 ultrathin nanosheets for promoting photocatalytic hydrogen evolution

2017 ◽  
Vol 46 (40) ◽  
pp. 13935-13942 ◽  
Author(s):  
Jinhua Xiong ◽  
Kaiqiang Jing ◽  
Junhua Zou ◽  
Shijing Liang ◽  
Ling Wu
Keyword(s):  
Charge Transfer ◽  
Hydrogen Evolution ◽  
Interfacial Charge Transfer ◽  
Photocatalytic Hydrogen Evolution ◽  
Ultrathin Nanosheets ◽  
Interfacial Charge

A hybrid of CdS/HCa2Nb3O10 ultrathin nanosheets with a tough heterointerface was successfully fabricated. Efficient interfacial charge transfer from CdS to HCa2Nb3O10 nanosheets was achieved to realize the enhanced photocatalytic H2 evolution activity.

Synergetic effect of functionalized carbon nanotubes on ZnCr–mixed metal oxides for enhanced solar light-driven photocatalytic performance

RSC Advances ◽  
2016 ◽  
Vol 6 (44) ◽  
pp. 37689-37700 ◽  
Author(s):  
Yajie Zhu ◽  
Pingxiao Wu ◽  
Shanshan Yang ◽  
Yonghong Lu ◽  
Wen Li ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Charge Transfer ◽  
Metal Oxides ◽  
Photocatalytic Performance ◽  
Synergetic Effect ◽  
Solar Light ◽  
Mixed Metal Oxides ◽  
Functionalized Carbon Nanotubes ◽  
Mixed Metal ◽  
Interfacial Charge

Functionalized CNTs played a key role in facilitating the interfacial charge transfer, which accounted for the significantly enhanced photocatalytic performance.

Understanding the interfacial charge transfer in CVD grown Bi2O2Se/CsPbBr3 nanocrystals heterostructure and its exploitation in superior photodetection: Experiment vs. Theory

Nanoscale ◽  
2021 ◽  
Author(s):  
Md Tarik Hossain ◽  
Mandira Das ◽  
Joydip Ghosh ◽  
Subhradip Ghosh ◽  
Pravat K. Giri
Keyword(s):  
Charge Transfer ◽  
Energy Harvesting ◽  
Crucial Role ◽  
High Performance ◽  
Van Der Waals ◽  
Interfacial Charge Transfer ◽  
Semiconductor Heterostructure ◽  
Efficient Charge ◽  
Energy Harvesting Devices ◽  
Interfacial Charge

Efficient charge transfer in 2D semiconductor heterostructure plays a crucial role in high-performance photodetectors and energy harvesting devices. Non-van der Waals 2D Bi2O2Se has enormous potential for high-performance optoelectronics, though...

Sign in / Sign up

Export Citation Format

Share Document